HK, My comment about wanting a bit more protection was in regard to the Hexamid. I think the beak that I just had added will be helpful for some rain and hail storms. But with that said I really like nylon/polyester long sleeve shirts. They take permetherin very well. They are extremely versatile-cool enough for the heat. Roll down the sleeves and put up the collar to prevent sunburn. And do the same when it gets chilly.
But I know the Weminuche fairly well--I grew up in Durango and hiked that wilderness area frequently. That is much higher than the Rahwahs or Zerkels. On my trips this past summer I could lose elevation fairly quickly if needed and get into some protected areas. In the Weminuche you are up there and it takes awhile to find your way down. So, I would want more insulation and protection. I've been caught in some tremendous storms around La Ventana, Ute Lakes, etc. But the good thing about getting through a storm is that you have some stories to tell and you keep your eye on the skies a bit more keen.
With your question to me about the shirt; are thinking about pairing a good base layer shirt with something like the REI Sahara? Even a long sleeve base layer shirt? I think that combination would be fine. Did you take some puffy insulation, like a down vest or jacket with you on your trip in '04?